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Danfoss OMR80 151-0411 Hydraulic Orbital Motor
Overview
The Danfoss OMR80 151-0411 is a medium-duty orbital hydraulic motor from Danfoss's versatile OMR series. As a fixed-displacement, high-torque motor, it efficiently converts hydraulic energy (pressure and oil flow) into mechanical energy (torque and rotational speed)-14-17. Engineered for reliable performance in a wide range of mobile and stationary applications, its design prioritizes compactness, durability, and high efficiency, making it a popular choice for demanding industrial environments. The OMR80 has been superseded by the enhanced OMRX80 model-2.
Technical Features
Advanced Gerotor Gear Set – The motor utilizes a robust Gerotor gear set with roller-equipped teeth. This design contributes to smooth, high-torque output at low speeds, increased efficiency, a high starting torque, and a long operational life-43-14-17. The OMR series' roller-equipped gears are particularly suitable for long periods of operation at high pressure-44.
Integrated Spool Valve – A spool-type distributor valve is integrated with the output shaft and driven by a cardan shaft-14-17. This design ensures precise filling and emptying of motor chambers, minimizing internal losses and contributing to high volumetric and mechanical efficiency.
Fixed Displacement – With a fixed displacement, the motor's output torque is determined by the system pressure, while its speed is directly controlled by the input flow rate. This simple, reliable relationship allows for easy speed control by regulating oil flow-14.
High Pressure Capability – The motor can handle high system pressures, with a maximum operating pressure of up to 200 bar (20 MPa) and a peak pressure rating of up to 225 bar-34-.
High Back Pressure Tolerance – Featuring an advanced sealing system, the motor can withstand high return line pressure without requiring a separate drain line. This simplifies hydraulic circuit design and improves overall reliability--6-43.
Robust and Compact Build – The OMR80 is constructed from cast iron and weighs approximately 6.5 to 6.9 kg-2-1. Its compact dimensions and high power density make it suitable for installation in space-constrained equipment--2.
High Bearing Capacity – The motor is engineered with a high radial and axial bearing capacity, allowing it to withstand substantial external forces on the output shaft, which is crucial for applications like wheel drives--43.
Bi-Directional Rotation – Designed for reversible operation, the OMR80 is a bi-directional motor, rotating clockwise or counter-clockwise by simply reversing the hydraulic flow-4.
Corrosion Resistance – The motor can be specified with corrosion-resistant parts for applications in harsh environments, enhancing its durability and service life-6-43.
Core Functionalities
High Starting Torque – The Gerotor design provides a high starting torque, enabling the motor to easily overcome heavy breakaway loads from a standstill--6-43.
Smooth and Constant Torque – The motor runs smoothly over its entire speed range and maintains a constant torque output, regardless of speed fluctuations, which ensures consistent performance--6-43.
Stepless Speed Control – As a fixed displacement motor, its speed is infinitely variable and directly proportional to the oil flow rate. Precise control from the minimum to maximum speed is achieved with a simple flow control valve.
Energy Efficient Operation – High mechanical and volumetric efficiency ensures minimal energy loss, converting a maximum amount of hydraulic energy into useful mechanical power. This reduces heat generation and overall system power consumption-6-43.
Long Life and Low Maintenance – The combination of robust materials, a roller-equipped gear set, and high bearing capacity ensures a long service life under demanding conditions, leading to reduced downtime and lower total cost of ownership--6-43.
Versatile Fluid and Circuit Compatibility – The motor is suitable for a wide variety of hydraulic fluids, including mineral oils and biodegradable fluids, and operates effectively in both open and closed-loop hydraulic systems, providing flexibility for system designers--6-43.
Application Sectors
The Danfoss OMR80 151-0411 is widely used across numerous industries where compactness, high torque, and reliability are essential. Its specific applications include:
| Industry Sector | Typical Applications |
|---|---|
| Agricultural Machinery | Balers, harvesters, forage harvesters, spreaders, and self-propelled sprayers for tasks requiring high torque and smooth operation--2-38. |
| Construction Equipment | Mini excavators, skid steer loaders, backhoe loaders, trenchers, and concrete mixers for powering auxiliary and drive functions-2-4-38. |
| Material Handling & Lifting | Forklifts, pallet stackers, aerial work platforms (scissor and boom lifts), and industrial winches for lifting and material transport applications-2-4-44. |
| Forestry Equipment | Wood chippers, stump grinders, brush cutters, and log splitters, where equipment must operate reliably in rugged outdoor environments-2. |
| Lawn & Turf Equipment | Commercial mowers, grass cutters, and landscaping equipment, leveraging the motor's lightweight and compact design-2-4-44. |
| Industrial & Stationary | Conveyor systems, rotary tables, mixing equipment, and injection molding machines for industrial automation and processing--38-44. |
| Marine & Offshore | Deck machinery such as winches, capstans, and steering gear on small to medium vessels--44. |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Danfoss |
| Series | OMR |
| Model Number | OMR80 151-0411 |
| Product Type | Orbital (Gerotor) Hydraulic Motor |
| Displacement | 80 cm³/rev (80 ccm/rev) -2-9 |
| Maximum Continuous Speed | 750 rpm -2-9-34 |
| Maximum Continuous Torque | 195 Nm -2-9 |
| Maximum Continuous Power | 12.5 kW -2-9 |
| Maximum Continuous Pressure Drop | 140 – 175 bar- |
| Maximum Continuous Inlet/Operating Pressure | 175 bar (175-200 bar)- |
| Maximum Intermittent Pressure | 200 bar- |
| Peak Pressure | 225 bar- |
| Maximum Flow Rate | 60 L/min- |
| Minimum Stable Speed | ~15 rpm (depending on load) |
| Rotation | Bi-directional (reversible) -4 |
| Shaft Type | 1" Cylindrical with straight key / 25 mm parallel key--34-2 |
| Flange Type | A2 (2-bolt A2 flange, 106.1 mm PCD)-2-34 |
| Port Style | Side ports-2 |
| Main Port Thread | G 1/2 (BSPP)-2-34 |
| Drain Port Thread | G 1/4 (BSPP)- |
| Housing Material | Cast iron-2-4 |
| Color | Black (RAL 9005)-2 |
| Weight | Approx. 6.5 – 6.9 kg-2-1 |
| Operating Temperature | -20°C to 80°C-2 |
| Fluid Cleanliness | ISO 4406 (c) class 20/18/15 recommended |
| Superseded by | OMRX80 11186671-2 |
Conclusion
The Danfoss OMR80 151-0411 is a robust, efficient, and highly versatile medium-duty orbital hydraulic motor that demonstrates Danfoss's leadership in LSHT technology. Its defining features include a durable Gerotor gear set with rollers, high starting torque, smooth and constant torque output across the speed range, high pressure and back pressure tolerance, and a compact, lightweight cast iron housing. These attributes make the OMR80 an ideal, energy-efficient solution for a vast array of applications, including agricultural machinery, construction equipment, material handling systems, forestry machines, and industrial automation. As a proven, reliable choice, the OMR80 provides a balance of performance and longevity suitable for a wide range of challenging hydraulic systems, and it continues to serve as a key reference for its successor, the OMRX 80.
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